I've seen pretty good video from the NDI Tools (https://www.ndi.tv/tools/ https://www.ndi.tv/tools/), which includes a pair of smartphone apps (one to transmit

I've seen pretty good video from the NDI Tools (https://www.ndi.tv/tools/ https://www.ndi.tv/tools/), which includes a pair of smartphone apps (one to transmit the camera, a second to transmit a screen capture), and a receiver program on the computer that can feed OBS or Zoom. From what I can tell, NDI is video codec intended for use in broadcast studios (high-quality, high-bandwidth, some compression but not a lot, UDP, assumes a local non-lossy network), and there's a batch of tools around it to emit/accept those streams: mixing decks, monitors, routers, etc. Resolution and frame rate seem excellent, latency feels to be about 1.0 seconds. Bonus points: it's made by NewTek, the original Amiga Video Toaster folks.